饰:Himself - Host
Melinda Gates
饰:自己
Emily Graslie
饰:自己
Grant Sanderson
饰:自己
饰:Self
Adande 'Swoozie' Thorne
饰:Self
饰:Self
饰:Self - Guest
饰:Self
Joe Penna
饰:Self
饰:Self
饰:Self
饰:Self
Barack Obama
饰:Self
饰:Self
饰:Self
饰:Self
饰:Self
Jamie Seymour
饰:Self
饰:Self
饰:Self
饰:Self
Coby Toland
饰:Self
Flula Borg
饰:Self
饰:Self
饰:Self
Hank Green
饰:Self
饰:Self
饰:Self
John Green
饰:Self
饰:Self
Neil deGrasse Tyson
饰:Self
饰:Self
Ivanka Trump
饰:Self
饰:Self
Bill Gates
Melinda Gates
Bill Gates
John Cox